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Microchip Technology AT49F001AN-55TU
- Part No.:
- AT49F001AN-55TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F001AN-55TU.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,884
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Product details
Overview
AT49F001AN-55TU from Atmel is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC with 55 ns read access time, 30 µs/byte programming, and sector-based architecture comprising one 16K-byte boot block, two 8K-byte parameter blocks, and two main memory blocks (32K + 64K bytes). It operates across the industrial temperature range (−40°C to +85°C) and supports hardware data protection, DATA polling, and toggle-bit erase/program status detection for embedded firmware storage applications.
For engineers reviewing the AT49F001AN-55TU datasheet, AT49F001AN-55TU pinout, AT49F001AN-55TU application, or AT49F001AN-55TU equivalent, this device serves as a drop-in replacement for legacy EPROM-based boot code storage where 5V-only operation, fast byte programming, and configurable boot-sector write protection are required in microcontroller-based systems.
Technical Context
The AT49F001AN-55TU implements a standard parallel Flash interface with CE/OE/WE control logic and internal command register sequencing for erase and program operations. Its sector architecture enables selective erasure of boot, parameter, and main memory blocks without affecting others - critical for field-upgradable firmware with protected bootloader regions.
It features dual-status detection (DATA polling on I/O7 and toggle-bit monitoring on I/O6), hardware VCC sense (<3.8V inhibit), noise filtering on WE/CE inputs, and RESET-driven boot-block override (not available on AN variant). The boot block address range is 1C000H–1FFFFH, distinct from the base AT49F001A(N) version.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits) - sufficient for full bootloader + configuration data in resource-constrained embedded systems |
| Read Access Time | 55 ns - enables direct execution from Flash (XIP) at up to ~12 MHz bus timing in compatible controllers |
| Byte Programming Time | 30 µs typical - allows rapid field updates of small firmware patches without long downtime |
| Erase Cycle Time | 3 seconds max for full chip - supports efficient background reprogramming during system idle periods |
| Endurance | 10,000 write/erase cycles - validated lifetime for infrequent firmware upgrades over 10+ years of industrial deployment |
| Power Dissipation | 20 mA active / 50 µA CMOS standby - suitable for low-power battery-backed or energy-sensitive applications |
| Operating Voltage | 5.0 V ±10% - eliminates need for auxiliary high-voltage programming supplies; compatible with legacy 5V logic buses |
Pinout & Package
AT49F001AN-55TU is packaged in a 32-lead Plastic Thin Small Outline Package (TSOP), Type I, 8 mm × 20 mm footprint (JEDEC MO-142, Variation BD), pin 1 marked by notch or bevel. Pin 9 is NC (no connect) per datasheet specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A11–A16 don't-care in some command cycles |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface for read, program, and status polling; I/O6 = toggle bit, I/O7 = DATA polling indicator |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during shared-memory access |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs - but boot-block override via 12V is disabled on AN variant |
| VCC | Power Supply | +5V supply; internal VCC sense disables programming if voltage drops below 3.8V |
| GND | Ground | Reference return path for all signals and power; decoupling capacitor placement critical near VCC/GND pins |
| NC (Pin 9) | No Connect | Unbonded pin in TSOP package; must remain unconnected per datasheet - no pull-up/down or routing allowed |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16K-byte boot block (1C000H–1FFFFH) supports permanent lockout via command sequence - ensures bootloader integrity during field updates |
| 5V-Only Reprogrammability | No external high-voltage generator needed; all commands executed using standard 5V logic levels - simplifies PCB design and reduces BOM cost |
| Dual Status Detection | Hardware-supported DATA polling (I/O7 complement) and toggle-bit (I/O6) enable reliable, interrupt-driven programming completion detection |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line gating (OE high/CE high/WE high inhibits programming) prevent accidental writes |
| Industrial Temperature Range | Specified for −40°C to +85°C operation - qualified for use in automotive ECUs, industrial HMIs, and outdoor communications equipment |
Applications
| Embedded Bootloader Storage | Firmware Configuration Storage |
|---|---|
Use Scenario: Storing immutable bootloader code in microcontroller-based industrial controllers that require secure startup and remote firmware updates. IC Role / Device Role / Timing Role: Nonvolatile program memory providing XIP-capable boot code with hardware-enforced write protection on the boot sector. Use Value: Prevents corruption of critical startup routines during power loss or failed update attempts, ensuring deterministic system recovery. |
Use Scenario: Holding calibration data, network settings, and user preferences in medical diagnostic devices requiring regulatory-compliant data retention. IC Role / Device Role / Timing Role: Parameter block (8K × 2) serving as persistent configuration store accessible via standard memory-mapped reads/writes. Use Value: Enables field-serviceable device personalization without requiring full firmware reflashing or external EEPROM. |
| Legacy System EPROM Replacement | Programmable Logic Configuration |
Use Scenario: Upgrading aging test equipment originally designed with UV-erasable EPROMs, where socket compatibility and 5V bus alignment are mandatory. IC Role / Device Role / Timing Role: Pin-compatible Flash memory emulating EPROM timing (CE/OE/WE interface) with identical 32-pin TSOP footprint. Use Value: Eliminates UV erasers and programming fixtures while retaining existing PCB layout and firmware drivers. |
Use Scenario: Storing configuration bitstreams for CPLDs in programmable logic controllers deployed in factory automation systems. IC Role / Device Role / Timing Role: Main memory block (32K + 64K) hosting volatile-configuration images loaded at power-on reset. Use Value: Supports rapid reconfiguration of logic functions without FPGA-level complexity or JTAG infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001BT-55REI | 48-pin SOJ package; 55 ns access; 3.0V–3.6V core (5V I/O tolerant); lacks boot-block lockout command | Requires level-shifting for pure 5V systems; no hardware boot protection - relies on software locks | Choose when migrating to lower-voltage platforms or needing higher endurance (100K cycles) |
| MX29LV001CTTI-55G | 32-pin TSOP; 55 ns; 3.0V–3.6V core (5V I/O tolerant); boot block at top address (1C000H–1FFFFH), same as AT49F001AN-55TU | Compatible pinout and sector map; requires 3.3V supply rail - not 5V-only | Prefer for new designs targeting 3.3V systems with identical boot architecture and footprint |
Compared with AM29LV001BT-55REI and MX29LV001CTTI-55G, the AT49F001AN-55TU uniquely delivers true 5V-only operation with hardware-enforced boot-block lockout - eliminating external voltage translation and enabling robust, zero-software-dependency bootloader protection in legacy 5V designs.
Availability
AT49F001AN-55TU is available at Aetrix Electronics and suitable for embedded bootloader storage, firmware configuration storage, legacy EPROM replacement, and programmable logic configuration requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for AT49F001AN-55TU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Atmel Corporation (now part of Microchip Technology) is a fabless semiconductor company specializing in microcontrollers, Flash memory, and secure authentication ICs, with a legacy of robust nonvolatile memory solutions for industrial and automotive markets.
The AT49F001A(N)(T) series was designed specifically for 5V in-system reprogrammable Flash applications where boot-code integrity, sector-level erasability, and EPROM drop-in compatibility are essential - targeting industrial control, telecom infrastructure, and legacy system modernization.
FAQ
What is the boot block address range for AT49F001AN-55TU?
The boot block address range for AT49F001AN-55TU is 1C000H to 1FFFFH (16K bytes), located at the top of the memory map. This differs from the base AT49F001A(N) variant, which places the boot block at 00000H–03FFFH. The AT49F001AN-55TU's top-aligned boot sector simplifies linker script configuration for most modern toolchains.
Does AT49F001AN-55TU support 12V RESET override for boot block reprogramming?
No, the AT49F001AN-55TU does not support 12V RESET override for boot block reprogramming. This feature is explicitly disabled for the "AN" variant per datasheet Note 6 and Section 3 ("RESET feature is not available for the AT49F001AN(T)"). Once boot lockout is enabled, only full chip erase with lockout disabled beforehand can modify the boot block.
What is the meaning of the "TU" suffix in AT49F001AN-55TU?
The "TU" suffix in AT49F001AN-55TU indicates a 32-pin TSOP (Type I, 8 × 20 mm) package with industrial temperature range (−40°C to +85°C) and 55 ns access time. "T" denotes TSOP, "U" denotes tape-and-reel packaging - consistent with Atmel's ordering nomenclature in the datasheet's Packaging Information section.
How does hardware data protection work in AT49F001AN-55TU?
AT49F001AN-55TU implements three hardware data protection mechanisms: (1) VCC sense circuitry inhibits programming if supply drops below ~3.8V; (2) programming is blocked unless CE is low, OE is high, and WE is low simultaneously; (3) input noise filter rejects pulses <15 ns on WE/CE. These operate independently of firmware, preventing accidental writes during brown-out or EMI events.
Can AT49F001AN-55TU be used in place of AT49F001A-55TU?
No - AT49F001AN-55TU and AT49F001A-55TU are not interchangeable. The "N" denotes a variant with different boot block location (1C000H–1FFFFH vs. 00000H–03FFFH) and absence of RESET-based boot override. Firmware and command sequences assuming bottom-aligned boot sectors will fail on AT49F001AN-55TU without modification.
AT49F001AN-55TU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49F001AN-55TU FAQ
1.How can I place an order for AT49F001AN-55TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001AN-55TU on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT49F001AN-55TU reliable?
The price and inventory of AT49F001AN-55TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001AN-55TU is usually 5 days.
3.What payment methods are accepted for AT49F001AN-55TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001AN-55TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001AN-55TU?
AT49F001AN-55TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001AN-55TU order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT49F001AN-55TU?
For technical support, including AT49F001AN-55TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001AN-55TU requirements.
6.How does Aetrix verify that AT49F001AN-55TU is sourced from the original manufacturer or authorized distributors?
All AT49F001AN-55TU products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT49F001AN-55TU meets industry standards.
7.What is the process for return or replacement of AT49F001AN-55TU?
All AT49F001AN-55TU units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001AN-55TU, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT49F001AN-55TU part is unused and in its original packaging.
Return procedure for AT49F001AN-55TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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